Horned Lizard Conservation Society
- Devoted to discovering why the Texas Horned Lizard (Phrynosoma cornutum) has declined in numbers so dramatically in recent years, and what can be done to reverse the process.

Horned Lizards
- The biology of the bizarre, spiny, ant-eating, Phrynosoma of North America.

Iguana iguana
- Taxonomy, description and photographs of the green iguana, its habitat and distribution, life history, physical tolerances, community ecology and invasion information.

Texas Horned Lizard
- Research project by Brad Meverden on Phrynosoma cornutum, including its habitat and geography, defense, nutrition, reproduction, interactions with other species and classification.